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This study of 479 children (avg age 14 yrs) referred to an outpatient clinic and undergoing holter monitoring found that 74 had inappropriate sinus tachycardia. Fish oil supplementation was associated with a decrease in inappropriate sinus tachycardia and an increase in heart rate variability. Comment: An increase in heart rate variability is generally considered to be beneficial. PLoS One . 2020 Aug 26;15(8):e0238139.    (retrieved Oct, 2020). There are currently 1090 pearls in the database. While every attempt has been made to ensure accuracy, mistakes can and do occur. Use databank at your own risk. All pearls © 2024 by the Internet Medical Association. Click Here to view more medical pearls.